Back pillow



FIG. 1 is a top perspective view of a back pillow in accordance with the present invention;

FIG. 2 is a bottom perspective view of the back pillow in FIG. 1;

FIG. 3 is a top plan view of the back pillow in FIG. 1;

FIG. 4 is a bottom plan view of the back pillow in FIG. 1

FIG. 5 is a left-side elevational view of the back pillow in FIG. 1;

FIG. 6 is a right-side elevational view of the back pillow in FIG. 1;

FIG. 7 is a front elevational view of the back pillow in FIG. 1; and,

FIG. 8 is a rear elevational view of the back pillow in FIG. 1. 

CLAIM The ornamental design for a back pillow, as shown and described. 